SI2435-F-FT 33.6kbps V.34 Fax Modem | Skyworks
料号： SI2435-F-FT ✓ 量产中SI2435-F-FT 概述
An ISOmodem is an integrated modem system that provides a compact interface between digital equipment and an analog telephone line. Its direct access arrangement, or DAA, handles the physical line connection, while the companion Si2417 provides the supporting system-side functions. The Si2435 is specifically designed for high-performance Group 3 fax communication systems and can operate across the 14,400 to 33,600 bit/s speed range identified for the chipset.
The SI2435-F-FT combines several communications functions in one package. Key features include a built-in phase-locked loop, DTMF detection, globally programmable telephone-line interfacing, and V.34 modem operation rated at 33,600 bit/s. Its 24-pin TSSOP package supports conventional surface-mount PCB assembly and is suitable for embedded fax, multifunction-printer, and office-equipment designs.
The Si2435 architecture integrates a third-generation direct access arrangement with the modem signal-processing functions. This integration reduces the number of external telephone-interface components required by the host system. The phase-locked loop supports stable synchronization within the modem design, while DTMF detection provides call-control information commonly used by telephone and fax equipment.
Typical uses include 33.6 kbit/s Group 3 fax machines, multifunction printers, fax servers, thermal-transfer fax products, and embedded communications modules. The two-chip Si2435 and Si2417 architecture is intended for designs that need telephone-line connectivity while preserving a compact implementation and avoiding a large collection of discrete analog-interface components.
When designing around the SI2435-F-FT, use the manufacturer’s reference circuit, exposed-pad or thermal-layout guidance where applicable, and the complete Si2435/Si2417 datasheet to establish the DAA network and digital interface. Check the host processor voltage levels, line-side protection requirements, and country-specific telephone-network interface implementation before releasing a production layout.
This product page combines manufacturer application guidance with package, interface, and sourcing information to help engineers identify the correct Si2435 configuration. It also documents the chipset relationship, explains the design roles of the Si2435 and Si2417, and highlights practical considerations for dependable embedded fax-modem integration.
直接替换替代料： SI2435-F-FT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
SI2435-C-FT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SI2435-F-FT 规格参数
| Product Type | V.34 fax modem IC |
| Maximum Modem Data Rate | 33,600 bit/s |
| ISOmodem Chipset Speed Range | 14,400 bit/s to 33,600 bit/s |
| Telephone-Line Interface | Globally programmable direct access arrangement |
| Phase-Locked Loop | Built-in phase-locked loop |
| DTMF Support | Built-in DTMF detection |
| 封装 | 24-pin TSSOP |
| 引脚数量 | 24 pins |
| 安装类型 | Surface mount |
| System Architecture | System-side ISOmodem |
| Chipset Configuration | Two-chip Si2435 and Si2417 design |
| Modem Protocol | V.34 |
| Fax Classification | Group 3 fax modem |
| Direct Access Arrangement Generation | Third-generation DAA |
SI2435-F-FT 24-pin tssop 引脚配置指南
SI2435-F-FT（24-pin tssop 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： SI2435-F-FT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI2435-F-FT 适用于 6 应用s: Group 3 Fax Machines, Multifunction Printers, Fax Servers, Thermal-Transfer Fax Products, Embedded Telephone Gateways, Industrial Fax Communication Modules.
Group 3 Fax Machines
The SI2435-F-FT fits a 33.6 kbit/s Group 3 fax machine because it combines a V.34 modem with an integrated globally programmable direct access arrangement. Placing it in the Si2435 and Si2417 chipset allows the equipment to connect to an analog telephone line while handling modulation, synchronization, and DTMF functions. The 24-pin TSSOP package supports compact controller-board layouts. Designers should reproduce the manufacturer DAA network and validate line protection for each target country.
推荐
Multifunction Printers
A multifunction printer can use the SI2435-F-FT to add a 33,600 bit/s fax modem without building the telephone-line interface from discrete analog blocks. The integrated DAA, built-in phase-locked loop, and DTMF detection support the fax and call-control functions required by many office appliances. The Si2417 companion device completes the two-chip chipset. Layout should follow the manufacturer reference circuit and preserve thermal and signal-integrity spacing around the 24-pin TSSOP.
推荐
Fax Servers
The SI2435-F-FT is suitable for embedded fax-server and network-fax appliances requiring a direct analog telephone-line interface. Its 33,600 bit/s V.34 modem capability and integrated third-generation DAA reduce external line-interface complexity, while DTMF detection supports signaling functions commonly exposed by fax servers. The Si2435 and Si2417 chipset is designed for compact implementations. Host firmware, line-coupling components, and country-specific protections still require complete circuit validation.
推荐
Thermal-Transfer Fax Products
Compact thermal-transfer fax products benefit from the SI2435-F-FT because the chipset provides 14,400 to 33,600 bit/s operation with an integrated programmable DAA in a 24-pin TSSOP package. This supports reliable fax transmission without an expansive discrete modem circuit. DTMF detection can assist with telephone control, and the phase-locked loop supports synchronization. Engineers should account for line-interface components, surge protection, and the thermal environment around the printer mechanism.
推荐
Embedded Telephone Gateways
The SI2435-F-FT can serve as the fax modem element of an embedded telephone gateway that bridges legacy Group 3 fax traffic with modern control or data-processing electronics. Its V.34 operation at 33,600 bit/s and integrated DAA provide the required analog-line modem functions, while DTMF detection supports call-control signaling. The 24-pin TSSOP package simplifies board integration, although gateway designers must validate echo, line-state, protection, and regulatory requirements.
推荐
Industrial Fax Communication Modules
Industrial equipment requiring remote document transmission can use the SI2435-F-FT as a compact V.34 fax interface. The chipset’s integrated DAA, phase-locked loop, and DTMF detection provide core telephone-line functions, while the 24-pin TSSOP package supports embedded assembly. The design remains sensitive to industrial noise, temperature, surge events, and telephone-network variation, so protective networks and grounding should be based on the manufacturer reference design and field requirements.
推荐
推荐产品汇总
工程参考数据： SI2435-F-FT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SI2435-C-FT |
|---|---|---|
| Package | 24-TSSOP | 24-TSSOP |
| Brand | Skyworks Solutions Inc. | Skyworks Solutions Inc. |
| Product Type | V.34 fax modem IC | V.34 fax modem IC |
| Maximum Data Rate | 33,600 bit/s | 33,600 bit/s |
| Chipset Speed Range | 14,400 bit/s to 33,600 bit/s | 14,400 bit/s to 33,600 bit/s |
| Telephone-Line Interface | Globally programmable third-generation DAA | Globally programmable third-generation DAA |
| Phase-Locked Loop | Built-in | Built-in |
| DTMF Detection | Built-in | Built-in |
| Chipset Partner | Si2417 | Si2417 |
| Ordering-Code Suffix | F-FT | C-FT |
关键差异点
- High V.34 fax throughput （对比 SI2435-C-FT)
- Integrated telephone-line interface （对比 SI2435-C-FT)
- Integrated signaling and synchronization （对比 SI2435-C-FT)
设计说明
Reproduce the DAA network and component placement from the manufacturer Si2435/Si2417 reference circuit, including the line-coupling and protection components. Keep the telephone-line side physically separated from digital clocks and interfaces, use the recommended grounding arrangement, and minimize loop area around sensitive analog nodes. The integrated DAA simplifies the design but does not eliminate careful high-voltage line-network layout.
Decouple each supply rail with the capacitance and placement specified in the manufacturer datasheet, placing the closest bypass capacitor directly between the appropriate power and ground pins. Verify host-interface logic levels and regulator headroom before connecting the Si2435 and Si2417 chipset. The operating voltage and absolute maximum limits are not stated in the product listing, so they must be taken directly from the manufacturer datasheet.
Route digital clock and data traces away from the DAA and telephone-line network, and follow the manufacturer’s recommended termination and grounding strategy. The built-in phase-locked loop supports modem synchronization, but board-generated jitter or return-path noise can still affect communication reliability. Validate the completed board for clock quality, DTMF detection, V.34 negotiation, and error recovery across representative line conditions.
Do not treat the SI2435 and Si2417 as independent single-chip modem solutions; the Si2435 is one half of a specified two-chip ISOmodem chipset. Confirm which functions each device provides before assigning PCB nets. Also verify the full ordering code, temperature grade, and package suffix before substituting SI2435-C-FT, because suffix differences can carry configuration or qualification requirements.
合规信息
No RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was identified for the exact ordering code. AEC-Q100 is not applicable because the SI2435 is a fax-modem interface IC rather than an automotive-qualified device.